High power, how do you do it?

Some of the most recent threads mention fairly powerful amps -- 200 Watts and even 500 Watts. Yet I find that the 100 Watts of my GK combo is more than enough to drive my bass into feedback, even with a magnetic pickup.

How do you guys make use of the more powerful amps? To put it another way, how far away does your amp have to be when you are playing in "loud" situations? Any other tricks? There are situations where I would not mind being louder, such as when backing up a big-band, but I see no point in getting a more powerful amp if I can't use the power that I've got.

That's right. Feedback largely comes from having the gain too high to compensate for not having enough power. The other aspect of having lots of power is that power = tone. Generally speaking, an 800watt power amp is going to provide better tone than 100watts. Feedback also dictates proper amp placement and good muting technique, but cranking the volume knob while keeping the gain knob low will solve most of your problems.

Also, feedback occurs at particular frequencies, so if you use a parametric equalizer, you can find the frequency and cut its volume. That's what notch filters do too.

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Agreed. One of the bands that I double in gets very loud (I use a full rack rig, with 3,000 watts), and I can get incredibly loud through my Kay upright once I have used a parametric EQ to dial out the worst feedback frequency. My Barberra pickup also appears to be fairly resistant to feedback, which I am sure helps.